BACKGROUND: Because gemcitabine and vinorelbine have demonstrated single-agent activity in non-small cell lung cancer (NSCLC), we conducted this phase I/II study to determine the maximum tolerated dose (MTD) and activity of these drugs combined. PATIENTS AND METHODS: Patients with inoperable or advanced NSCLC and no prior chemotherapy were treated with gemcitabine plus vinorelbine on days 1 and 8 every 21 days. The initial doses of gemcitabine 1,000 mg/m2 and vinorelbine 25 mg/m2 were escalated by 250 mg/m2 and 5 mg/m2, respectively, in separate patient cohorts until the MTD was established. RESULTS: In phase I, 32 patients received a total of 115 cycles. Dose-limiting toxicities were neutropenia and hepatotoxicity, occurring at the dose level of 1,500 mg/m2 and 30 mg/m2. Thus, the MTD used for phase II was 1,250 mg/m2 and 30 mg/m2. Of 41 patients in phase II, 16 (39%) achieved objective responses (95% confidence interval [CI] 24% to 54%), with a median time to progression of 4.2 months. Overall survival was 9 months (95% CI 5.7 to 12.7 months) and the 1-year survival rate was 31%. World Health Organization (WHO) > or = grade 3 neutropenia and reversible thrombocytosis occurred in 15% and 65% of patients, respectively. Non-hematologic toxicity was mild at all dose levels. Grades 3 and 4 hepatotoxicity were reported in one patient each. CONCLUSION: The combination of 1,250 mg/m2 gemcitabine and 30 mg/m2 vinorelbine on days 1 and 8 every 21 days is well tolerated and active in patients with NSCLC. These results should be confirmed in comparative studies.
BACKGROUND: Because gemcitabine and vinorelbine have demonstrated single-agent activity in non-small cell lung cancer (NSCLC), we conducted this phase I/II study to determine the maximum tolerated dose (MTD) and activity of these drugs combined. PATIENTS AND METHODS: Patients with inoperable or advanced NSCLC and no prior chemotherapy were treated with gemcitabine plus vinorelbine on days 1 and 8 every 21 days. The initial doses of gemcitabine 1,000 mg/m2 and vinorelbine 25 mg/m2 were escalated by 250 mg/m2 and 5 mg/m2, respectively, in separate patient cohorts until the MTD was established. RESULTS: In phase I, 32 patients received a total of 115 cycles. Dose-limiting toxicities were neutropenia and hepatotoxicity, occurring at the dose level of 1,500 mg/m2 and 30 mg/m2. Thus, the MTD used for phase II was 1,250 mg/m2 and 30 mg/m2. Of 41 patients in phase II, 16 (39%) achieved objective responses (95% confidence interval [CI] 24% to 54%), with a median time to progression of 4.2 months. Overall survival was 9 months (95% CI 5.7 to 12.7 months) and the 1-year survival rate was 31%. World Health Organization (WHO) > or = grade 3 neutropenia and reversible thrombocytosis occurred in 15% and 65% of patients, respectively. Non-hematologic toxicity was mild at all dose levels. Grades 3 and 4 hepatotoxicity were reported in one patient each. CONCLUSION: The combination of 1,250 mg/m2 gemcitabine and 30 mg/m2 vinorelbine on days 1 and 8 every 21 days is well tolerated and active in patients with NSCLC. These results should be confirmed in comparative studies.
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